I used a 30 gal Blazer tank fit under the rear frame, added a cross member, needed also for shocks after the rear was changed, and straps back to the rear support salvaged from the spare tire rack. The Blazer tank comes two ways to be used on an engine mounted fuel pump(low pressure) or fuel injected tank mounted pump (high pressure)but you need to specify. I ran the filler pipe betweeen the frame and bed and added a filler in the right fender. There is a picture of both under zeke's AD here
http://community.webshots.com/user/zeker6 Zeke
